Device for stopping trains or cars



H. J. DERBY. DEVICE FOR STOPPING TRAINS 0R CARS.

APPLICATION FILED JUNE 5.1916.

1,347,996, Patented July 27, 1920.

PATENT OFFICE- HOLLIS J. DERBY,VOF AMHEBST, QHIO.

DEVICE FOIR, STOPPING. TRAINS 0R CARS.

Application filed .Tune 5, 1916.

pertains to make and use the same.

This invention relates to a device for stopping trains or cars.

An object of the invention resides in the provision of an improved mechanism which will be automatic in its operation.

A further object of the invention resides in so constructing the device that itma-y'be readily installed and so that its operation will be positive and will apply the air brakes or close the throttle.v

IVith these and other objectsv in view, such as will appear as my description progresses, my invention comprises thecom bination and arrangement of parts as set forth in and falling within the scope of the appended claims. i

In the drawing;

Figure 1 is a side elevation of the preferred embodiment of my invention showing the same attached to the throttle controlling arm' f Fig. 2 is a longitudinal sectional view of the same;

Fig. 3 is a plan view, andv Fig. 4 is an elevation of a modification of my device;

Fig. 5 is a diagram showing how this mechanism is actuated as the locomotiveV passes a signal.- p

Referring to the embodiment of.y the invention illustrated in Figs. 1 to 3 inclusive, I have provided a cylinder 1 which is closed at its inner end by a cap 2 which has a centrally located opening 3 therein and at its outer end by a threaded plugor cap 4 which has a threaded opening therein. This cylinder 1 is supported on a bracket 5 by means of clamps 6, which bracket is provided with an arm 7 extending at right angles to the body portion thereof and is adapted to be secured to a suitable portion of a locomotive or car. A piston 9 is mounted and'operable in the cylinder 1 and is provided with a rod 10 which extends through the opening 3 in the cap 2 and slidably through an opening Specification of Letters Patent.

Patented July 27, I1920.

serial No. 101,815.

11 in the arm 7. t This rod is provided withy a shoulder 12 which is adapted vto abut against the cap 2 to limit the movement of thevpiston in lone direction, which movement is resisted by a coil spring 13` which en-Y circles the rod and bears at one end against the arm 7 and at the other end against a sleeve 14 which is securedto the rod externally of the cylinder. This cylinder is also provided with an exhaust port 15 opening laterally at about'its midlength, and normally the piston 9 stands between this port and the cap 4 while the shoulder 12 stands between the port and the cap 2. The space within the cylinder between the piston and cap 4 constitutes an expansion chamber, and within it may be disposed an explosive ma-V terial, introduced by removingthe cap as will be clear. Through the opening of this cap is screwed a spark plug .16, shown diagrammatically in Fig. 1 as included in an ignition circuit 17V which leads through anv interrupter and a normally open circuit .Closer or switch 17. From the shaft. of the latter rises a finger Fstanding in position to strike a semaphore signal S carried by a post P alongside the track,'when said signal isset at danger as seen in Fig. 5; This closes the switch 17 and produces a spark in the gap of the plug 16 and by this spark the explosive material willbe ignited and the piston 9, rod 10, and sleeve 14 will be moved longitudinally. This sleeve 14r is adapted to be connected to one ofthe motive power levers 18 so that when it is moved.

the throttle will be closed orthe air brakes Y applied. As the piston moves pastI the exhaust port 15 the gases resultingfrom the` explosion within the expansion chamber will pass from the cylinderjby way of the port. 'The inward movement of the rod is limited by the contact of the shoulder 12 with the inner cap 2, at whichtime'the pis-1 ton has passed well beyondQthe port, thel .explosion chamber because of the ratherl close lit of the piston within the cylinder. It follows that after the action of the device to throw the lever, it will immediately react to swing the lever back a certain distance, and then continue to react more deliberately. y

In. Fig. 4 of the drawing, I have illustrated two elements A and B, the element A being identical with the embodimentshown in Figsjl to 3 inclusive and Vinasmuch as this is true I will not enter into a detailed description of this element A but will designatefthe similar parts Vby similar reference characters primed. The sleeve 14 is connected to a valve actuating( arm 19, which arm is connected to a valve 2O in an air or steam pipe 21, which pipe leads from a suitablel storage tank or boiler 22. The element B Vis likewise similar to the embodiment shown in Figs. 1 to 3 inclusive with the exception that the sparkk plug at the outer end'of the cylinder is omitted and the pipe 21 is connected to the cylinder by way of the opening in the cap 4. In this element partssimilar to those of the element A are designated by similar characters primed. The sleeve 14 on the element B carries an arm V18 which is connected to the motive power lever, as shown.

In the operation-of this embodiment the explosion occurs in the element A, which .explosion operates the arm 19 so that the.

valve 20 is opened andthe airor steam passes through the pipe 21 to the expansion chamber of the cylinder of the element B.

Y The entrance of the air or steam in this sion chamber, because fluid is constantly flowing out the port 15. The valve 2O will not close until the piston within the element A` resumes substantially its originalV and normal-position; Hence it will-bve seen that, in both embodiments of the. invention the restorationy of parts to normal depends on the Jforce of the spring V13, the looseness n of the piston within the cylinder, and the extent of movement'fimparted to the lever orrother member` 18, and therefore the disy tance it must move back in order to resume its original position. l

Vhile I have illustrated and described a particular embodiment of luy-invention, it `has merely been for the sake of convenience and I do not wish to be limited to that particular embodiment as it is obvious that numerous changes may be made in the details of construction without departing from the spirit of the invention `or exceeding the scope' of the appended claims.

What I claim is f Y 1. In a device of the class described, the combination with a cylinder having perfof rated caps at its ends and an'exhaust port at about its midlength, a spark plug in the perforation of the outer cap and included in anignition circuit, a piston within the cylinder between this cap and Vsaid port, the space between such cap and piston constituting an expansion chamber adapted to contain an explosive, and means for closing said circuit; of a rod leading from the piston through thefperforation in the inner cap, a' shoulder lixed on the rod in position to strikethis cap when the piston has passedsai'd port, aV spring bearing the rod and pistonnormally inward, and a lever connected with and actuated by movements of said rod. Y Y l k2. InV a device of the class described, the combination with a cylinder having perforated caps at its ends and an exhaust port at about its midlength, a'spark plug in the perforation of the outer cap and included in an ignition circuit, a piston* within the cylinder between this cap and said port, the space between such Vcap and piston constituting anl expansion chamber adapted to Ycontain an explosive, and means for closing said circuit; of a rod leading from the piston through the perforation 1n the inner cap, a fixed arm having a guide'opening for said rod, a sleeve fast on the rod, an ex-l pansive spring coiled on the rodV between the sleeve and guide, andbonnections 'between the sleeve and a motive power lever.

In testimony whereof, I aiix my signature, kin the presenceY of two witnesses.

'y l v HOLLIS J. DERBY.

lVitnesses R. DERBY,

Gno.'A. MoGRATi-I. Y. 

